Braking mechanism



Nov. 12, 1929. J. J. DILKSQJR 1,735,452

BRAKING MECHANISM Filed Dec. 22. 1926 4 Shets-Sheet 1 I INVENTOR: Jamea/JflzZafJl;

ATTORNEY Nov. 12, 1929. v J. J. DILKS, JR v 1,735,452

BRAKING MECHANISM Filed Dec. '22. 1926 4 Sheets-Sheet 2 INVENTOR:

Nov. 12, 1929. J. J. DILKS, JR

BRAKING MECHANISM Filed Dec. 22, 1926 4 Sheets-Sheet 3 v INVENTOR:

JfimJ ATTORNEY llll k Nov. 12, 1929.

J. J. DILKS, m 1,735,452

BRAKING MECHANISM Filed Dec. 22, 1926 4 Sheets-Sheet 4 I INVENTOR BY 1 /%EY Patented Nov. 12, 1929 BRAKING MECHANISM Application filed December 22, 1926. Serial No. 156,446.

Objects of the present invention are to'provide for the convenient and gradual applicatlon of brakes under air or liquid pressure automatically followed by the gradual, automatic release of the brakes; to provide for properly and gradually controllinglthe brake nism from operating the brake lever and at the same time to provide for permitting quick application and release of the brakes; and to operate by air or liquid pressure an inlet and an air or liquid pressure exhaust valve from the same rod.

Other and further objects of the present invention reside in means for accomplishing the above objects and still further objects will appear from the following description.

The invention consistsof the novel construction hereinafter described and finally claimed.

The nature, scope of the invention will be more fully understood from the following description 7 taken in connection with the accompanying drawings forming part hereof, and 1n which Fig. 1, is a View in top elevation of braking mechanism embodying the nvention;

Figure 2, is a side or plan view thereof. Fig. 3, is an end view of Flg. 2.

Fig. 4, is a view in section taken upon'hne 4-4 of Fig. 2. I r

.Fig. 5,. is an enlarged view, principally in section, of the lower righthand side of Fig. 2. Fig. 6, is a view taken upon the line 6-6 of Fig. 9.

Fig. 7, is a view in section taken upon the line 77 of Fig. 9..

line 8-8 of Fig. 9.

characteristic features and Fig. 8, is a view in section taken upon the 7 Fig. 9,-is a view upon an enlarged scale of certain parts shown'inFig. ,5.

Fig. 10, is a view similar to Fig. 9 but illustrating a difi'erentposition of parts; and Fig. '11, is a fragmentary viewillustrating a somewhat modified arrangement whereinv the exhaust pressure may be utilized fora l further purpose. j o For the purpose of illustrating my invention I have shown in the accompanying drawings two forms; thereof which are at present preferred by me, since the same have been; found in practice to give, satisfactory and reliable results, although it is to be understood that the various instrumentalities of which I my-invention consists can'b'e variously a'rranged and organized and that my invention is not limited to the precise-arrangement and organization ofthe instrumentalities as hereinfshown and described. In the drawings the reference letter A designates the horizontally arranged twopart operating rod having a lost motion chamber therebetween which in practice may p be connected with a hand lever or foot pedal (not shown) and which forms no part of thepresent invention. Arranged in parallelism therewith and operating at all times in uni-' son with said rod A are a pair of superimposed, horizontal rods designated B and C respectively. The three rods are connected by an angular member or bracket H in any suitable manner. Thus,we find that. movement of the rod A to the right in Fig. 9carries the rod B in the same direction against the tension of coiled spring a upon rod B so that the latter spring presses against the flanged sleeve 7) which slides withthe for ward motion of rod B to cause compression of said spr ng against valve cl upon seat 6, o

'operatively connected with which sleeve 2) is the yoke b of a bell-crank lever 0, pivoted at 0 The forward movement of rods A and B, thus described, causes the lowerarm of thebell crank lever to pressvalve (Z down j upon its seat 6. This movement of parts prevents the escapement of air or pressure fluid from chamber h. This position is'proba'bly best seen in Fig. 10. During this movement of parts, rod C has also moved'to the right in unison with rods A and B, thus causing the shoe or tapered cam 7, which is fixed to rod C to move from the position shown in Fig. 9 to that shown in Fig. 10, thus gradually or progressively opening the tapered admission valve 9 against lts spring 9 to admit air or liquid pressure to enter chamber h, just referred to. It is to be noted that this move ment of valve is possible because ofthe upper, cylindrical stem 9 which is in the path of travel of the tapered part of the shoe'or cam 7. As the valve 9 opens, air or liquid pres:

' the flanges of sleeve 0 which is fast upon rod F and which in turn is arranged in'the same plane with operating red A, together with connectionF of which the head P is a part and head A which encloses chamber G con stitutes the direct connection with the brakes '(not shown) and may in fact be termed the brake-rod connection, since lever L is vided wlth a yoke n engaged between the pro- ' 4 flanges 0 which are secured to rod F for operating means of a sliding sleeve in end of rod A with a head I being independent of the operation of the fluidpressure, on piston D. It may be stated, at this point, that the con-- nection F is caused to move to the right in Fig.5, thatis, in the same direction as operating rodA, but at a greater speed, it being un derstoodthat the rod A at one end is pro-= vided with the cylindrical chamber G, within which the cylindrical head P of connection F is free to reciprocate at proper periods of operation- The chamber G, which is closed at each end, is slidable longitudinallyupon a member A, and through a boss A as carried'by a fixed part of the apparatus. The

end of shaft A which moves through boss A carried chamber G. v

The above description has dealt chiefly with gradual brake application and the same having been accomplished, a description will now be given of the brake release operation subsequentthereto. In this release operation,

' rods A,B, and 0 move to the leftin Fig. 10,

so thatthe bell crank lever 0 is moved'about its pivot point 0 to permit raising of valve (Z through pressure of air or liquid within chamber it, said pressure thus 'egressing through ports 6. The rod C meanwhile moves to the left in'Fig. l0 and permits the shoe or tapered cam f to close valve 9 and thus shut off air or liquid from the supply tank through connection I. However, in the connection', it is tobe observed that when air orliquid pressure within chamber it, over comes the pressure of spring a, the exhaust ports 6 will open regardless of the position of operating rod A.

Taking up now the air or pressure fluid supply it may be stated that the same may be supplied from any suitable source forming no part of the present invention. However, it is convenient to store the same in a tank or reservoir designated J, see Figs. 1, 2, 3, 4:, and the storage is maintained at a constant or nearly equal pressure as possible. Obviously, a relief valve and pressure gage are essential. A connection L leads from tank J to inlet connection I of the operating unit, see Fig. 3. I

Thetank or reservoir J may be supported in any suitable manner as for example upon the chassis rail M of a motor vehicle, by

means of a bracket N. In turn, for illustrative purposes only, the operatingunit may be supported by a bracket 0 from the same chassis rail M, because as previously-stated, this invention is not limited to a motor vehicle braking device, although very desirable" and eflicient for that purpose. The brake may be applied with a gradual application and a gradual release; also may be applied with an emergency application and an instant release, this being done by the quickness of the foot of operator.

,In Fig. 11, there is shown a modified form in which the rod Eand lever Z are the same as shown in the foregoing figures, butwhen the spring E is too weak to properly re of the braking parts by rearward movement of rod Fto permit the escape ofair at port Z. The operation of chamber Y is caused by the instant release of air by means of valve (Z and only releases the brakes .fromthe unit back and has no effect or action upon the chamber or piston D.

What I claim is 1. In a device of the character stated com-' prising brake applying mechanism, three parallel rods 'operatively connected together for movement iii-unison, the uppermost rod being arranged to operate the other two rods, a chamber for containing pressure, and normally open at the top and closed at its bottom by vertically arranged valves, a horizontally disposed horizontally arranged tapered shoe for opening one valve and a bell crank lever for closing the other valve, and means connecting the first mentioned rod with the other two rods for effecting said movements.

2. In a device of the character statedcomprising brakeapplying mechanism, three parallel rods operatively connected together for movement in unison, the uppermost rod being arranged to operate the other two rods, a lost motion device arranged between said upper most rod. and. the brake applying mechanism, a chamber for containing pressure, and. normally open at the top and closed at its bot tom by vertically arranged valves, a horizon tally disposed tapered shoe for opening one valve and a bell crank lever for closing the other valve, and means connecting the first mentioned rod with the other two rods for effecting said movements. I

JAMES J. DILKS, JR. 

